Only provide accessible state for System tray bubbles when they can be focussed
Only provide accessible state for System tray bubbles when they can be focussed


R=dmazzoni@chromium.org
BUG=chromium-os:29012
TEST=See bug


Review URL: http://codereview.chromium.org/10108010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133152 0039d316-1c4b-4281-b951-d872f2087c98

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